1.6 TDI 85kW - Humming / whining under load

I have a 2018 Octavia with the 1.6 TDI 85kW engine and manual transmission. I noticed that there is a humming noise when engine has load at 1500-2000 RPM. This is clear with the 4th and 5th gears. I can also hear it with 2nd and 3rd gears but very shortly. Maybe there's a very faint whine when I'm reving the engine stationary.

I was afraid that it's gearbox whine but I've driven a VAG car with whining gearbox and it sounded different. I think it could be just the engine and turbo combined? So, when the engine has to work hard at lower RPM's there's whine. This doesn't happen before 1500RPM even though the engine already has torque there. Also, I tried driving with the window down with trees and bushes next to me but couldn't hear anything else but engine noise and turbo spooling. With a faulty gearbox there was a clear grinding noise which sounded like whining inside.

I found a video which has exactly the same noise. For example, at 2.54 the driver starts to accelerate and engine noise changes. You might need headphones but I can clearly hear the same "whine or humming" I have.

https://youtu.be/sylqeaqvVlw